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b in (-oo:+oo)
b/27 = 72/81 // - 72/81
b/27-(72/81) = 0
b/27-8/9 = 0
1/27*b-8/9 = 0 // + 8/9
1/27*b = 8/9 // : 1/27
b = 8/9/1/27
b = 24
b = 24
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